linux-kernel - Re: [PATCH] cmd_dtc: Enable generation of device tree symbols

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Message-ID: <e7e0751f-991f-baa5-0c76-598542d5fdd5@gmail.com>
Date:   Tue, 26 Jan 2021 12:01:55 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Cyril Brulebois <cyril@...amax.com>,
        Uwe Kleine-König <uwe@...ine-koenig.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Arnd Bergmann <arnd@...db.de>, linux-kbuild@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols

+frank

On 1/25/21 5:15 AM, Cyril Brulebois wrote:
> Hi,
> 
> Uwe Kleine-König <uwe@...ine-koenig.org> (2021-01-25):
>> Adding the -@ switch to dtc results in the binary devicetrees containing
>> a list of symbolic references and their paths. This is necessary to
>> apply device tree overlays e.g. on Raspberry Pi as described on
>> https://www.raspberrypi.org/documentation/configuration/device-tree.md.
>>
>> Obviously the downside of this change is an increas of the size of the
> 
> (as spotted by Uwe right after sending →) increase
> 
>> generated dtbs, for an arm out-of-tree build (multi_v7_defconfig):
>>
>> 	$ du -s arch/arm/boot/dts*
>> 	101380	arch/arm/boot/dts-pre
>> 	114308	arch/arm/boot/dts-post
>>
>> so this is in average an increase of 12.8% in size.
>>
>> Signed-off-by: Uwe Kleine-König <uwe@...ine-koenig.org>
> 
> Tested-by: Cyril Brulebois <cyril@...amax.com>
> 
> with:
>  - a Raspberry Pi CM3
>  - a carrier board designed after the official IO Board V3
>  - an RTC accessible over I²C, made functional via a DTB overlay, that
>    can only be enabled once bcm2710-rpi-cm3.dtb has been generated with
>    this patch applied.
> 
> 
> Cheers,
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

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